基于认知无线电的WiMAX系统多用户资源分配算法

Multiuser WiMAX Resource Allocation Algorithm Based on Cognitive Radio

基于认知无线电(CR)和OFDM的传输特性,提出了一种WiMAX系统多用户资源分配算法。感知用户根据认知到的频谱资源信息,在不对授权用户造成干扰的前提下使用空闲频谱资源。利用注水算法对多个用户请求使用同一子载波进行裁决,在满足传输速率以及QoS要求下,完成子载波、比特和功率分配,使整个系统传输功率最小。仿真结果表明,基于认知无线电的WiMAX系统多用户资源分配算法的传输功率和性能明显优于使用静态算法方案的系统。

Based on the OFDM technique and the character of Cognitive Radio（CR）, a muhiuser WiMAX resource allocation algorithm is proposed. Based on the spectrum information detections, cognitive users use the vacant spectrum resources under the condition of not disturbing the primary users. By using the water-filling algorithm to find one or more users＇ requesting under the same subcarrier, and in order to satisfy the bit rate and QoS demand, several important parts are achieved to minimize the total transmit power, such as subcarrier and bit and power allocation. The simulation results indicate that the method has the lower transmitting power and better performance compared with static algorithms.